There’s an easy and straightforward way to renew your library books online.Â Log into your library account using your name and Caltech ID number (don’t forget the three leading zeroes).Â Your account will have a list of anything checked out to you.Â Check-mark the titles you wish to renew and click on one of the Renew buttons.Â As always, if you have any problems, please don’t hesitate to contact your friendly library staff.